# rewind

From cppreference.com
< c‎ | io

Defined in header ``<stdio.h>`` |  |
void rewind( FILE *stream ); |  |

Moves the file position indicator to the beginning of the given file stream.

The function is equivalent to fseek(stream, 0, SEEK_SET);, except that end-of-file and error indicators are cleared.

The function drops any effects from previous calls to ungetc.

### Parameters

stream | - | file stream to modify

### Return value

(none)

### Example

This example shows how to read a file twice

Run this code

    #include <stdio.h>

    char str[20];

    int main(void)
    {
        FILE *f;
        char ch;

        f = fopen("file.txt", "w");
        for (ch = '0'; ch <= '9'; ch++) {
            fputc(ch, f);
        }
        fclose(f);

        f = fopen("file.txt", "r");
        fread(str, 1, 10, f);
        puts(str);

        rewind(f);
        fread(str, 1, 10, f);
        puts(str);
        fclose(f);

        return 0;
    }

Output:

    0123456789
    0123456789

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.21.9.5 The rewind function (p: 338)

- C99 standard (ISO/IEC 9899:1999):

  - 7.19.9.5 The rewind function (p: 304)

- C89/C90 standard (ISO/IEC 9899:1990):

  - 4.9.9.5 The rewind function

### See also

fseek | moves the file position indicator to a specific location in a file (function)
C++ documentation for rewind

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